Remove most superfluous getter arguments from dart2js.

dart/lib/compiler/implementation/code_buffer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class CodeBuffer implements StringBuffer {
   StringBuffer buffer;
   List<SourceLocation> sourceLocations;
   int lastBufferOffset = 0;
 
   CodeBuffer()
       : buffer = new StringBuffer(),
         sourceLocations = new List<SourceLocation>();
 
-  int get length() => buffer.length;
+  int get length => buffer.length;
 
   bool isEmpty() {
     return buffer.isEmpty();
   }
 
   /**
    * Converts [object] to a string and adds it to the buffer. If [object] is a
    * [CodeBuffer], adds its source locations to [sourceLocations].
    */
   CodeBuffer add(var object) {
@@ skipping 56 matching lines @@
     });
   }
 }
 
 class SourceLocation {
   final Element element;
   final Token token;
   final int offsetDelta;
   SourceLocation(this.element, this.token, this.offsetDelta);
 }